<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Input Type: radio</title>
</head>
<body>

<form action="/demo/demo_form.asp">
  <input type="radio" name="sex" value="male" checked>Male
  <br>
  <input type="radio" name="sex" value="female">Female
  <br><br>
  <input type="submit">
</form>

</body>
</html>